Gemini 3.1 Flash Lite Preview API
About
Build advanced reasoning agents with Gemini 3.1 Flash Lite Preview, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.25/1M input and $1.50/1M output tokens, native tool calling support. Access Gemini 3.1 Flash Lite Preview via the Vertex API with up to 66K output tokens.
Capabilities
Input Modalities
textimagevideoaudio
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.25
Output
$1.50
Caching (per 1M tokens)
Read
$0.03
Audio (per 1M tokens)
Input
$0.50
Frequently Asked Questions
Gemini 3.1 Flash Lite Preview by Vertex costs $0.25 per 1M input tokens and $1.50 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.
Model Details
ID
gemini-3.1-flash-lite-preview
Provider
VertexFamily
gemini-flash-lite
Release Date
Mar 3, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/google-vertex
Environment Variables
GOOGLE_VERTEX_PROJECT
GOOGLE_VERTEX_LOCATION
GOOGLE_APPLICATION_CREDENTIALS